<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>环境监测实验刷题系统</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { 
            font-family: Arial, sans-serif; 
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh; 
            padding: 20px; 
        }
        .container { max-width: 800px; margin: 0 auto; }
        .header { text-align: center; margin-bottom: 30px; color: white; }
        .header h1 { font-size: 2rem; margin-bottom: 10px; }
        .card { 
            background: white; 
            border-radius: 15px; 
            padding: 30px; 
            box-shadow: 0 10px 30px rgba(0,0,0,0.2); 
        }
        .stats { 
            display: flex; 
            justify-content: space-around; 
            margin-bottom: 25px; 
            flex-wrap: wrap; 
        }
        .stat-item { text-align: center; padding: 15px; }
        .stat-number { font-size: 2rem; font-weight: bold; color: #667eea; }
        .stat-label { font-size: 0.9rem; color: #666; }
        .btn {
            display: block;
            width: 100%;
            padding: 18px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            text-decoration: none;
            text-align: center;
            border-radius: 15px;
            font-size: 1.2rem;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            margin: 10px 0;
        }
        .btn:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(0,0,0,0.3); }
        .footer { text-align: center; color: white; margin-top: 30px; font-size: 0.9rem; opacity: 0.8; }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>🧪 环境监测实验刷题系统</h1>
            <p>专业题库 | 移动优化 | 即时批改</p>
        </div>

        <div class="card">
            <div class="stats">
                <div class="stat-item">
                    <div class="stat-number">8</div>
                    <div class="stat-label">个实验</div>
                </div>
                <div class="stat-item">
                    <div class="stat-number">50+</div>
                    <div class="stat-label">道题目</div>
                </div>
                <div class="stat-item">
                    <div class="stat-number">3</div>
                    <div class="stat-label">种题型</div>
                </div>
                <div class="stat-item">
                    <div class="stat-number">100%</div>
                    <div class="stat-label">移动适配</div>
                </div>
            </div>

            <a href="quiz.html" class="btn">开始刷题 🚀</a>
            <div class="footer">
                <p>© 2024 环境监测实验刷题系统</p>
            </div>
        </div>
    </div>
</body>
</html>